How to create the correct date-time field?

I would like to load such files to an Oracle table using external tables. However I do not know which Oracle Data Type I'm going to create for the first field (which is May 28 ...) while creating table.

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You said, you're doing a "insert into oracle-table select * from external-table"?!
If you define that date column upon your oracle-table then you could do "insert into oracle-table select col1, col2, col3, to_date(col4, 'mon dd hh24:mi:ss') from external-table".
For the create table statement, regarding your oracle table, there is no need to cast with to_date function unless you do the loafding via CTAS....

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